gpio: driver for 42 AB8500 GPIO pins

To get rid of port expanders, the free GPIOs of ab8500
can be used. There are 42 GPIO pins. Out of which 16
are interrupt capable.This patch implements 16 virtual
IRQ mapped to 16 interrupt capable AB8500 GPIOs.
Signed-off-by: Bibek Basu <bibek.basu@stericsson.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
[Renamed header file as per MFD structure]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -414,4 +414,9 @@ config GPIO_JANZ_TTL
 	  This driver provides support for driving the pins in output
 	  mode only. Input mode is not supported.
 
+config AB8500_GPIO
+	bool "ST-Ericsson AB8500 Mixed Signal Circuit gpio functions"
+	depends on AB8500_CORE
+	help
+	  Select this to enable the AB8500 IC GPIO driver
 endif

drivers/gpio/Makefile

@@ -42,3 +42,4 @@ obj-$(CONFIG_GPIO_JANZ_TTL)	+= janz-ttl.o
 obj-$(CONFIG_GPIO_SX150X)	+= sx150x.o
 obj-$(CONFIG_GPIO_VX855)	+= vx855_gpio.o
 obj-$(CONFIG_GPIO_ML_IOH)	+= ml_ioh_gpio.o
+obj-$(CONFIG_AB8500_GPIO)       += ab8500-gpio.o

drivers/mfd/ab8500-core.c

@@ -362,6 +362,15 @@ static void ab8500_irq_remove(struct ab8500 *ab8500)
 	}
 }
 
+static struct resource ab8500_gpio_resources[] = {
+	{
+		.name	= "GPIO_INT6",
+		.start	= AB8500_INT_GPIO6R,
+		.end	= AB8500_INT_GPIO41F,
+		.flags	= IORESOURCE_IRQ,
+	}
+};
+
 static struct resource ab8500_gpadc_resources[] = {
 	{
 		.name	= "HW_CONV_END",
@@ -595,6 +604,11 @@ static struct mfd_cell ab8500_devs[] = {
 	{
 		.name = "ab8500-regulator",
 	},
+	{
+		.name = "ab8500-gpio",
+		.num_resources = ARRAY_SIZE(ab8500_gpio_resources),
+		.resources = ab8500_gpio_resources,
+	},
 	{
 		.name = "ab8500-gpadc",
 		.num_resources = ARRAY_SIZE(ab8500_gpadc_resources),

drivers/mfd/ab8500-i2c.c

@@ -97,7 +97,7 @@ static void __exit ab8500_i2c_exit(void)
 {
 	platform_driver_unregister(&ab8500_i2c_driver);
 }
-subsys_initcall(ab8500_i2c_init);
+arch_initcall(ab8500_i2c_init);
 module_exit(ab8500_i2c_exit);
 
 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");

include/linux/mfd/ab8500.h

@@ -74,6 +74,45 @@
 #define AB8500_INT_ACC_DETECT_21DB_F	37
 #define AB8500_INT_ACC_DETECT_21DB_R	38
 #define AB8500_INT_GP_SW_ADC_CONV_END	39
+#define AB8500_INT_ACC_DETECT_1DB_F	33
+#define AB8500_INT_ACC_DETECT_1DB_R	34
+#define AB8500_INT_ACC_DETECT_22DB_F	35
+#define AB8500_INT_ACC_DETECT_22DB_R	36
+#define AB8500_INT_ACC_DETECT_21DB_F	37
+#define AB8500_INT_ACC_DETECT_21DB_R	38
+#define AB8500_INT_GP_SW_ADC_CONV_END	39
+#define AB8500_INT_GPIO6R		40
+#define AB8500_INT_GPIO7R		41
+#define AB8500_INT_GPIO8R		42
+#define AB8500_INT_GPIO9R		43
+#define AB8500_INT_GPIO10R		44
+#define AB8500_INT_GPIO11R		45
+#define AB8500_INT_GPIO12R		46
+#define AB8500_INT_GPIO13R		47
+#define AB8500_INT_GPIO24R		48
+#define AB8500_INT_GPIO25R		49
+#define AB8500_INT_GPIO36R		50
+#define AB8500_INT_GPIO37R		51
+#define AB8500_INT_GPIO38R		52
+#define AB8500_INT_GPIO39R		53
+#define AB8500_INT_GPIO40R		54
+#define AB8500_INT_GPIO41R		55
+#define AB8500_INT_GPIO6F		56
+#define AB8500_INT_GPIO7F		57
+#define AB8500_INT_GPIO8F		58
+#define AB8500_INT_GPIO9F		59
+#define AB8500_INT_GPIO10F		60
+#define AB8500_INT_GPIO11F		61
+#define AB8500_INT_GPIO12F		62
+#define AB8500_INT_GPIO13F		63
+#define AB8500_INT_GPIO24F		64
+#define AB8500_INT_GPIO25F		65
+#define AB8500_INT_GPIO36F		66
+#define AB8500_INT_GPIO37F		67
+#define AB8500_INT_GPIO38F		68
+#define AB8500_INT_GPIO39F		69
+#define AB8500_INT_GPIO40F		70
+#define AB8500_INT_GPIO41F		71
 #define AB8500_INT_ADP_SOURCE_ERROR	72
 #define AB8500_INT_ADP_SINK_ERROR	73
 #define AB8500_INT_ADP_PROBE_PLUG	74
@@ -141,6 +180,7 @@ struct ab8500 {
 
 struct regulator_reg_init;
 struct regulator_init_data;
+struct ab8500_gpio_platform_data;
 
 /**
  * struct ab8500_platform_data - AB8500 platform data
@@ -158,6 +198,7 @@ struct ab8500_platform_data {
 	struct ab8500_regulator_reg_init *regulator_reg_init;
 	int num_regulator;
 	struct regulator_init_data *regulator;
+	struct ab8500_gpio_platform_data *gpio;
 };
 
 extern int __devinit ab8500_init(struct ab8500 *ab8500);

include/linux/mfd/ab8500/gpio.h

+/*
+ * Copyright ST-Ericsson 2010.
+ *
+ * Author: Bibek Basu <bibek.basu@stericsson.com>
+ * Licensed under GPLv2.
+ */
+
+#ifndef _AB8500_GPIO_H
+#define _AB8500_GPIO_H
+
+/*
+ * Platform data to register a block: only the initial gpio/irq number.
+ */
+
+struct ab8500_gpio_platform_data {
+	int gpio_base;
+	u32 irq_base;
+	u8  config_reg[7];
+};
+
+#endif /* _AB8500_GPIO_H */